Reduce Reuse Recycle (Level 100) — Using the Spycraft or Spotter Perk, intercept 25 enemy projectiles with a hacked Trophy System. — 2,500 XP
This challenge could be easier in Multi-Team or Battle Royale modes, where Trophy Systems on vehicles are considered meta and are frequently found across the world. Scope out these machines, especially Cargo Trucks, and look for a Trophy System on the hood so you can make it your own and speed away (hopefully) unscathed.
In Black Ops Cold War, it may be wise to have the Engineer Perk in your loadout as well, since it highlights enemy Trophy Systems and other equipment with a bright red light.
Remote Assistance (Level 110) — Call in 5 Scorestreaks or Killstreaks in a match 25 times. — 8,500 XP (Three Tiers)
Song’s Operator Mission, unlocked at Tier 40 of the Battle Pass, overlaps with this challenge through its second objective.
For this Seasonal Challenge, low cost and low cooldown Scorestreaks are essential in Black Ops Cold War, as you can fire out Air Patrols with zero cooldown (so long as the enemy keeps throwing up Scorestreaks) or Spy Planes and Armor multiple times if you get enough score over time.
Alternatively, you could hop into Warzone and throw out any combination of five UAVs, Cluster Strikes, and Precision Airstrikes. This will cost you a minimum of $15,000 of in-game Cash to pull this off, so do your best to complete Contracts to afford these powerful items. Who knows? The Contracts themselves may reward you with a Killstreak for free!
Picked Off (Level 120) — Get 50 Longshot Headshot kills using Sniper Rifles. — 8,500 XP (Three Tiers)
This can be easy in Warzone, as there are plenty of opportunities to hit 100+ meter snipes.
Alternatively, look to bigger maps in Black Ops Cold War’s Multiplayer, such as the one introduced in Season Three Reloaded: Duga.
For either game, be sure to adjust your aim to account for bullet velocity. You may need to lead your shot above and ahead of a moving target in order for your high caliber bullet to hit its mark.
Hot Air (Level 130) — Get 300 kills while aiming down sights using a weapon with an attached thermal scope. — 8,500 XP (Three Tiers)
Thermal scopes are usually the last unlockable attachment for most Black Ops Cold War Primary Weapons.
Take your favorite Max Level Weapon – preferably a Tactical Rifle, to make a dent in an earlier Seasonal Challenge – and consider using Smoke Grenades in a loadout with it; they will obstruct your enemy’s view while your thermal optic cuts through it like a knife through butter.
One thing to watch out for, though, are enemies who are using the Cold Blooded Perk. They won’t be highlighted on your thermal optic, so be on the lookout for humanoid figures who show up cold, lest they go under the radar to bring you down.